Hey guys, I am going out for a three day trip in ohiopyle this weekend. Tempe should get down to 60 at the coldest, so fairly warm. I am using an eno hammock with a thermo rest inflatable foam pad. Using a blue tarp for a fly, 10 x 12. My question is on a sleeping bag. I have a kelty mummy rated to -15. It's very warm and bulky. I often have to unzip it in the winter because I get too hot. Could I get away with just a simple fleece blanket and a pullover? I don't want to get out there and freeze, but I also don't want to lug weight I don't need. Thoughts or suggestions? Caveat is I am on a $0 budget so it's either the bag or something in my house.